Safety-alarm for steam-boilers.



l. A. LEAVITT. SAFETY ALARM FOR STEAM BOI'LERS. APPLICATION FILED MAY 3, |916.

I Mmmm Patented Nov, 28, 1916.

M w m I i m S11/MMIII oz L; UmwWwI/@W is mountedr withinethe cylinder, and H is a l.

JAMES A. LEAVITT, 0F IILMPOC, CALIFORNIA.

SAFETY-ALARM ZIEOJE?, S'lllEAlUl-BOILERS.

neonati.,

To all 'whom t may concern."v v Y ,Y Be it lmown thatl, JAMES Arlinnvi'rr, a citizen ofthe Uni ed States, residing at Lompoc, in the county of Santa Barbara and State of California, have invented certain newv and useful llmprovements lin Safety-Alarms'for Steam-Boilers; and l do 'hereby declare the following'ito be a f ull3f 4 clear, and exact description of the invention,

such as will. enable others skilled inthe art to which it appertains to make and use the.

same, reference being had to the accompanying drawings, and to the letters and figures of yreference marked thereon, which form a part of this specification.

'lhis invention relates to new and useful improvementsf in automatic 'safety ldevices for steam boilersand the object in view is to produce a device of this nature whereby,

in the event of the water becoming low in the boiler, a signal will be sounded and the fuel supply shut od.'

'lhe inventioncomprises ,various details of construction, combinations and arrangey tion. Fig. 2 is an enlarged.A detail sectional' view on line 2-2 of lFig. l.

n r t h a t decaan j e @Tence now @mg a o the boiler lowering to a dangerous level and of the drawings'by letter, A ldesignates a steam boiler and B the crownfsheet therein, and designates a 4valve cylinderhaving threaded connection with an aperture in the top of the boiler. 1 A' steam supply pipe D leads to and communicates 'with the interior of said cylinder and an enit steam pipe E leads therefrom; A reciprocating valve'h stemor plunger connected at its upper end A to said valve and its lower end is Haring as at l and rests inthehollow cup portion of the threaded .plug 11K, whichlatter fits within a threaded aperture inthe crown sheet B Said plug has ducts'll-. therein, and hl designates a filling of; 'fusible' metal contained within the hollow portion'of said plugv and in said ducts.' A- threaded plug llly is. mounted within the upper portion of the piston cylinder and is apertured vfurthe reception of the plunger U, the lower end of which hpecicati'on'iof Letters Patent.

lmaterited'lllov. 2S, Jlwllh..y

v application nea iray a, ieie. serial iro. aaien.

i engages a hollow in the upper surface of said valve and its upper end flares at 0' and against which the lower end of the coiled springl R bears, the upper end of said spring engaging a plate S hollowed out,`

upon its upper surface and engaged by the inner end of the set screw T vwhich is fitted A in a threaded aperture in the cap, as shown clearly in Fig. 2 of the drawings, said' cap being adapted` to regulate the tension of the spring R which bears against the plunger and which/in turn, through the medium said valve, bears against the stem .l-l, thus tending to normallyfhold the latter at its farthest lowestb limit. "lhe exit steam pipe E has a whistle X communicating therewith and provided for the purpose of sounding a signal when the metal fuses and steam makes exit through the pipe E ea route to the steam-actuated valve W which controls the passageway through the fuel pipe V leading to the burner Y'Jwhich sup. plies fuel to the furnace of the boiler.

rllhe operation of' my invention will' be readily understood and is as follows When the apparatus is set, the fusible inet-al is placed in a molten condition in the hollow portion of the plug valve K and the valve is held in the position shown in llFig. 2 of the drawings in a closed relation, preventing steam entering the piston cylinder from the pipe l) and the plunger U holding the valve through the medium of the spring set screw'l. ln the event ofthe waterin the temperature of the boiler being sumcien't to cause the metal within the plug vto fuse, the metal will make exit through the ducts in the bottom of the plug valve'Kv and the coiled spring will force the piston down Tac andallow the steam to pass from the pipe l) 4 into the piston cylinder and thence through the pipe E, causing the whistle to blow and the fuel. supply to be automatically out ed, as will be readily understood.

Whatl claim 'to be new is :1-

A safety devicev for boilers comprising-.a

boiler ,and a crown sheet having registering apertures, a recessed threaded plug Ahaving threaded connection with loneof thev apertures and provided with ducts 'leading from the bottom of the recessed portion thereof through the end of the plug, the recess in the plug adapted to contain a fusible metal, a plunger having a head movable within im e lld

said recess and adapted to rest upon the fusible met-al therein, a cylinder having threaded connection with the aperture in the Wall of the boiler and centrally apertured for the reception of the stem of said plunger, a valve in the cylinder connected to the upper end of the lplunger stem, the

walls of the cylinder being provided With apertures, one above and one below the valve, pipes communicating With apertures of the cylinder, a threaded plug tted to the upper end of the cylinder and centrally O. C. GENTRY,

GRAICE FRICK. 

